Any commerical sofware to backup Wii disks?

My 4.5 years old son loves playing Wii. However, he just damaged a Wii disk after two week playing. The game does not work any more. Now, I'm restricting him from touching the Wii disks. He has to call me to load and unload the disks.

The Wii games are very expensive, $50 apiece. I'm wondering if there is any commercial backup software available for Wii disks?